Display device and method of manufacturing same

Abstract

A display device includes a substrate on which a plurality of pixels are disposed; a bank defining emission areas of the plurality of pixels; and an emission layer formed in each of the emission areas, wherein the bank includes a first bank extended in row and column directions; a second bank disposed on the first bank and extended in the column direction to separate adjacent pixel columns; and a third bank disposed on the second bank, wherein the first bank is hydrophilic, and each of the second bank and the third bank has a hydrophobic upper surface.

What is claimed is: 
     
       1. A display device comprising:
 a substrate on which a plurality of pixels are disposed; 
 a bank defining emission areas of the plurality of pixels; and 
 an emission layer formed in each of the emission areas, 
 wherein the bank comprises:
 a first bank extended in row and column directions; 
 a second bank disposed on the first bank and extended in the column direction to separate adjacent pixel columns; and 
 a third bank disposed on the second bank, 
 wherein the first bank is hydrophilic, and each of the second bank and the third bank has a hydrophobic upper surface. 
 
 
     
     
       2. The display device of  claim 1 , wherein an upper portion of the third bank has a T shape and has an area greater than a lower portion of the third bank, and a first hole is disposed between the second bank and the upper portion of the third bank. 
     
     
       3. The display device of  claim 2 , wherein the emission layer has an edge portion inside the first hole and has a surface height higher than a central portion of the emission layer. 
     
     
       4. The display device of  claim 3 , wherein the edge portion and the central portion are continuous or separated from each other at a periphery of the second bank. 
     
     
       5. The display device of  claim 3 , wherein the edge portion of the emission layer is in contact with a side surface of the second bank. 
     
     
       6. The display device of  claim 2 , further comprising a fourth bank disposed on the second bank spaced apart from the third bank,
 wherein the first hole is surrounded by the second bank, the upper portion of the third bank and the fourth bank. 
 
     
     
       7. The display device of  claim 6 , wherein the emission layer has an edge portion inside the first hole and has a surface height higher than a central portion of the emission layer. 
     
     
       8. The display device of  claim 7 , wherein the edge portion and the central portion are continuous or separated from each other on an upper surface of the fourth bank. 
     
     
       9. The display device of  claim 2 , wherein an upper portion of the second bank has a T shape and has an area greater than a lower portion of the second bank, and a second hole is disposed between the first bank and the upper portion of the second bank. 
     
     
       10. The display device of  claim 9 , wherein the emission layer has an edge portion inside the second hole and has a surface height higher than a central portion of the emission layer. 
     
     
       11. The display device of  claim 10 , wherein each of the first bank and the third bank has a tapered shape having an inclined side surface. 
     
     
       12. A display device comprising:
 a plurality of emission areas defined in a display panel; 
 a hydrophilic bank extended in row and column directions and defining the plurality of emission areas; 
 a first bank disposed on the hydrophilic bank and extended in the column direction to separate adjacent pixel columns; and 
 a second bank disposed on the first bank, and the first and second banks have an upper surface with hydrophobic, 
 wherein each of the first and second banks and the hydrophilic bank has an upper portion having an area greater than a lower portion.